Some roads in and around Stroud were closed on Sunday morning because of the town's half marathon. The temporary closures included the A419 between Cainscross Roundabout and Gannicox Lane.
Inspector Nick Holmes, of Gloucestershire Police, said: "As the A46 is also closed, the delays may be greater than usual this year.
"We would ask people to stay away [from Stroud on Sunday] unless they have essential visits to make."
Other road closures included the B4008 between Standish Church and the junction of the A38; Nupend Lane from the A38 at Whitminster to the entrance to the Little Chef on the A419 and the Paganhill Lane in both directions.
The Oldends Lane junction with Bristol Road and at its junction with Midland Road in Stonehouse was also shut on Sunday morning.
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